Color cathode ray tube having improved focus

Details Color cathode ray tube having improved focus Color cathode ray tube having improved focus

1995-05-19

1997-04-15

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 14, 313414, 313449, G01S 316, G01S 328

Patent

active

056212860

ABSTRACT:
A color cathode ray tube includes an electron beam generating source, a first accelerating electrode, a focus electrode, and a second accelerating electrode, for focusing an electron beam onto the phosphor screen. The length of the focus electrode is equal to or larger than two times the diameter of the main lens, and the highest voltage is applied on the first accelerating electrode and the second accelerating electrode, and a voltage lower than the highest voltage is applied on the focus electrode, and the length of the first accelerating electrode is within the range from about 0.4 to 2 times the diameter of the electron beam passage aperture formed in the surface of the first accelerating electrode on the side of the electron beam generating source.

REFERENCES:
patent: 5113112 (1992-05-01), Shimoma et al.
patent: 5449983 (1995-09-01), Sugawara et al.
patent: 5523648 (1996-06-01), Son et al.

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